Beneath a skylight, a central staircase with a red railing climbs from the ground-level living areas to the more private upper levels, which have pine flooring. “It’s a softwood,” says architect Sébastien Parent, “but as soon as there’s a little scratch, it’s more beautiful.” Photo 3 of 17 in ADUs by Anna Quisel from There’s a Surprising Twist at Every Turn in This Montreal Townhouse

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Beneath a skylight, a central staircase with a red railing climbs from the ground-level living areas to the more private upper levels, which have pine flooring. “It’s a softwood,” says architect Sébastien Parent, “but as soon as there’s a little scratch, it’s more beautiful.”